Avigator - Tilt Sensor

Description

The tilt sensor was constructed from an Analog Devices ADXL202 two-axis accelerometer. The ADXL202 provides a duty-cycle-modulated output, and reads ą2g. Details of tilt-sensor design are given in the data sheet for the device. The completed board is a one-sided PCB, about one inch on a side, and weighs less than 0.2 oz.

Schematic (pdf)
PCB layout (pdf)
zipfile of all design files (protel,gerber,plt)

Results of sensor characterization tests:

Input Voltage: 4.98V

Axis	Position	T_LOW (ms)	T_HIGH (ms)	Duty Cycle
X	flat on table	0.34	0.36	51.4%
	pin 1 down	0.43	0.27	38.6%
	pin 1 up	0.24	0.46	65.7%
Y	flat on table	0.30	0.40	57.1%
	pin 1 down	0.39	0.31	44.3%
	pin 1 up	0.20	0.50	71.4%

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Revised 6/7/99